摘要
以坡面5年生金丝柳和毛白杨为研究对象,采用土柱法测定2种扦插植物的根系分布特征,并应用Le Bissonnais法中快速湿润处理测定2种扦插植物不同土层土壤水稳性团聚体稳定性和可蚀性特征,测定指标包括:>0.25 mm土壤水稳性团聚体含量(R0.25)、土壤团聚体平均质量直径(MWD)和土壤可蚀性因子K值。分析坡面2种扦插植物根系分布特征及其对土壤团聚体的影响,结果表明:1)扦插植物根系集中分布在树干周围0~40 cm土层内,以>5 mm的粗根为主;2)在0~100 cm土层,根系含量、土壤团聚体稳定性和抗侵蚀能力均随土层深度的增大而减小;3)金丝柳根系在提高土壤团聚体稳定性和抗侵蚀能力方面强于毛白杨;4)扦插植物R0.25与<1 mm根系含量均呈现显著正相关关系,说明根系改善土壤团粒结构的性能主要取决于<1 mm根系含量。
The root distribution characteristics of two cuttage plants （five-year-old Salix alba var. tristis and Populus tomentosa）were measured by soil column method. The stability of water-stable aggregates and erodibility characteristics in different-layer soil under two cuttage plants were measured by rapid wetting treatment in Le Bissonnais method, and the measuring index included water-stable aggregates （ 〉 0.25 ram） content （R0.25）, mean weight diameter of aggregates （MWD） and factor of soil erodibility （K）. Root distribution characteristics of two cuttage plants on the slope and their effects on soil aggregates were analyzed. The results showed that ： 1 ） the roots of two cuttage plants mainly distributed in the 0 - 40 cm soil layer around the trunk, with 〉5 mm thick roots as the main components. 2） In the 0 -100 cm soil layer, the root content, soil aggregate stability and soil erosion resistance decreased with the increase of soil depth. 3） In the aspect of increasing soil aggregate stability and erosion resistance through root system, Salix alba var. tristis was better than Populus tomentosa. 4） R0.25 and 〈 1 mm root content showed a significantly positive correlation, indicating that the performance of roots in improving soil aggregate structure was mainly determined by 〈 1 mm root content.
作者
孙一惠
马岚
张栋
夏晓平
薛孟君
苗新云
SUN Yi-hui MA Lan ZHANG Dong XIA Xiao-ping XUE Meng-jun MIAO Xin-yun(Beijing Engineering Research Center of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, P. R. China Beijing Shenghailin Ecological Environmental Technologies Corp., Beijing Forestry University, Beijing, 100083, P. R. China.)
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2017年第7期54-61,共8页
Journal of Beijing Forestry University
基金
北京市科技计划课题(Z151100001115001)
西宁防洪及流域管理利用世行贷款项目(XN-C-2012-04)
国家自然科学基金项目(41501297)
关键词
扦插
金丝柳
毛白杨
根系分布
土壤团聚体
cuttage
Salix alba var. tristis
Populus tomentosa
root distribution
soil aggregate
